<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table class="treetable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false"
        show-index index-text="#" border :show-row-hover="false">
        <template slot-scope="scope" slot='isok'>
          <i class="el-icon-success" v-if="scope.row.cat_deleted===false" style="color:lightgreen"></i>
          <i class="el-icon-error" v-else style="color:red"></i>
        </template>
        <!-- 排序 -->
        <template slot-scope="scope" slot="order">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag size="mini" v-else-if="scope.row.cat_level===1" type="success">二级</el-tag>
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
          <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeCateFormById(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum" :page-sizes="[1, 2, 5]" :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper" :total="total">
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <!-- 添加分类的表单 -->
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <!-- options用来指定数据源 -->
          <el-cascader expand-trigger='hover' v-model="selectedKeys" :options="parentCateList" :props="props" @change="parentCateChanged" clearable change-on-select>
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        props:{ 
          value:'cat_id',
          label:'cat_name',
          children:'children'
        },
        //选中的父级分类的id数组
        selectedKeys:[],
        parentCateList: [],
        //添加分类的表单数据对象
        addCateForm: {
          //将要添加的分类名称
          cat_name: '',
          //父级分类的id
          cat_pid: 0,
          //分类的等级,默认为一级
          cat_level: 0
        },
        //添加分类表单的验证规则对象
        addCateFormRules: {
          cat_name: [{
            required: true,
            message: '请输入分类名称',
            trigger: 'blur'
          }, ]
        },
        //控制添加分类对话框的显示与隐藏
        addCateDialogVisible: false,
        //查询条件
        queryInfo: {
          type: 3,
          pagenum: 1,
          pagesize: 5
        },
        //商品分类的数据列表,默认为空
        catelist: [],
        //总数据条数默认为0
        total: 0,
        //为table指定列的定义
        columns: [{
            label: '分类名称',
            prop: 'cat_name'
          }, {
            label: '是否有效',
            //表示当前列定义为模板列
            type: 'template',
            //表示当前这一列使用模板名称
            template: 'isok'
          },
          {
            label: '排序',
            type: 'template',
            template: 'order'
          }, {
            label: '操作',
            type: 'template',
            template: 'opt'
          }
        ]
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
     async  removeCateFormById(id){
       const confirmResult= await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err); 
        console.log(confirmResult);
        if(confirmResult!=='confirm') {
          return this.$message.info(`已取消删除`)
        }
       const {data:res}=await this.$axios.delete('categories/'+id)
       if(res.meta.status!==200){
         return this.$message.error(`删除分类失败`)
       }
       this.$message.success(`删除分类成功`)
       this.getCateList()        
      },
      //监听对话框的关闭事件,重置表单数据
      addCateDialogClosed(){
        this.$refs.addCateFormRef.resetFields()
        this.selectedKeys=[]
        this.addCateForm.cat_level=0
        this.addCateForm.cat_pid=0
      },
      addCate(){
        this.$refs.addCateFormRef.validate(async valid=>{
          if(!valid) return
          const {data:res}=await this.$axios.post('categories',this.addCateForm)
          if(res.meta.status!==201){
            return this.$message.error(`添加分类失败`)
          }
          this.$message.success(`添加分类成功!`)
          this.getCateList()
          this.addCateDialogVisible=false
        })
      },
      // 选择项发生变化触发这个函数
      parentCateChanged(){
        console.log(this.selectedKeys);
        //如果selectedKeys数组中的length大于0,证明选中了父级分类
        //反之,就说明没有选中任何父级分类
        if(this.selectedKeys.length>0){
          this.addCateForm.cat_pid=
          this.selectedKeys[this.selectedKeys.length-1]
          //为当前分类的等级赋值
          this.addCateForm.cat_level=this.selectedKeys.length
          return
        }else{
          this.addCateForm.cat_pid=0
          this.addCateForm.cat_level=0
        }
        
      },
      //获取父级分类的数据列表
      async getParentCateList() {
        const {
          data: res
        } = await this.$axios.get('categories', {
          params: {
            type: 2
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error(`获取父级分类数据失败`)
        }
        console.log(res.data);
        this.parentCateList = res.data
      },
      showAddCateDialog() {
        //先获取父级分类的数据列表
        this.getParentCateList()
        //再展开对话框
        this.addCateDialogVisible = true
      },

      //监听pagesize改变
      handleSizeChange(newSize) {
        this.queryInfo.pagesize = newSize
        this.getCateList()
      },
      //监听pagenum改变
      handleCurrentChange(newPage) {
        this.queryInfo.pagenum = newPage
        this.getCateList()
      },
      async getCateList() {
        const {
          data: res
        } = await this.$axios.get('categories', {
          params: this.queryInfo
        })
        if (res.meta.status !== 200) {
          this.$message.error(`获取菜单列表失败!`)
        }
        console.log(res.data);

        //把数据列表复制给catelist
        this.catelist = res.data.result
        this.total = res.data.total

      }
    }
  }
</script>
<style lang="less" scoped>
  .treetable {
    margin-top: 15px;
  }
  .el-cascader{width: 100%;}
</style>